# SDR BGSS2016FA0000427

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 14, 2016
- Submitted: September 14, 2016
- Operation: General aviation
- Aircraft: [N1306M](https://openairdocs.org/aircraft/N1306M), registered now
- Make and model: Cessna 172S
- Registry model: [Cessna 172S](https://openairdocs.org/model/cessna-172s) (OpenAirDocs)
- Aircraft serial: 172S10336
- Aircraft time: 4,494 hours
- Engine: Lyc IO360L2A
- Engine time: 4,747 hours
- Propeller: Mcauly 1A170E
- System (JASC): [8530 · Reciprocating Engine Cylinder Section](https://openairdocs.org/jasc/8530)
- Part: Exhaust Valve
- Part number: 17B23936
- Condition: Sticking
- Location: Engine
- Part time: 295 hours
- Component: Cylinder, Lyc
- Component part number: 05K21104
- Stage of operation: CR
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/BGSS2016FA0000427

## Discrepancy

COMPRESSION ON NR 4 CYLINDER DETERIORATED TO AN OUT OF LIMIT CONDITION OVER A PERIOD OF 150 HOURS.  A STICKING EXHAUST VALVE WAS DETERMINED TO BE THE ROOT CAUSE.

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